Some Essential Things after getting start with terminal in Ubuntu

Manual:

   Most of the Commands have manuals. These manuals are an interface to the on-line reference manuals.

How to use these manuals ?
 Command format: man [command name]
 Command: man man    ... It sounds crazy yaa....

How to get escape from manuals ?
  Press Small Q to quit manuals.

Details about manuals:

1. Name of Command
2. Synopsis
3. Description
4. Overview
5. Defaults.
6. Options
7.Exit Status
8. Environment
9. Files
10. See Also
11. History
12. Copyright
13.Author

Some details are optional.

The Next Command Similar to Man command..

Information(Info Command):

How to use Info command?

Command: info [command_name]
Command: info ls

How to get quit from information on terminal?
Press 'q'.

What more u have in info command:
 1. Name of command with some meaning of command in short,
 2. Synopsis,
 3. Description,
 4. Options,
 5. Examples,
 6. Reporting bugs,
 7. Copyright information.

Double Tab Trick:

 Use whenever u forget the full command name,or when you want to see the combinations starting from letter or word.

Command: blue and press tab twice.
Output:

These are the name combinations which start from blue.

 How to see Previous typed commands:

 Command: history
 Output: all commands which u entered till last command.

Alternative to that,we can also see previous commands:

  Don't enter any command,just press up arrow key to see previous commands.

Useful: when we have big commands and  rewriting that whole command again take time and which can decrease typing time.

How to see menu options using Launcher ?

   Keep open ur one window and press Alt button.launcher will launch .It will see as..

How to execute command as the superuser ?

Command: sudo [system related command name or to open system related files.]

 Sudo command allows a permitted user to execute a command as a superuser or another user,as specified by security policy.The default security policy is sudoers, which is configured via the file /etc/sudoers.

Now we will use sudo command as below with our new command:

How to shutdown your pc through terminal ?

    Firstly try only-
    Command: shutdown -P 1 "It was awesome experience"
    Now,Type this:
    Command: sudo shutdown -P 1 "It was awesome experience"
    He will ask root password.. so enter your login password.
    Output:
         

To cancel the process running from terminal can be killed by pressing "Ctrl+c".


Wildcards:
  This is one of the crazy part in enjoying the typing and decreasing typing time.
These are useful in many ways for a GNU/Linux Systems and for various other uses. Commands can use wildcards to perform actions on more than one file at a time, or to find part of a phrase in a text file. There are two different major ways  that wildcards are used, they are globbing patterns/standard wildcards that are often used by the shell.
Standard wildcards are used by various command-line utilities to work with multiples files.

To check manual page for wildcards:
 command: man 7 glob

With wildcards also read manual page for regular expressions:
 command: man 7 regex

Example: I want to go to folder Music using wildcards
Command: cd M*
Output:
shrenoid@shrenoid-Inspiron-5520:~$ cd M*
shrenoid@shrenoid-Inspiron-5520:~/Music$

* is a asterik Wild-Card: any combination of character.
M*: word starting with M and having n number of letter in it.